#3F45E0#3F45E0

#3F45E0 is a mid, highly saturated blue. Relative luminance 0.107; OKLCH L 49.5% C 0.229 H 272.7°. Best body text is #FFFFFF at 6.69:1 contrast (WCAG AA passes).

Color values

HEX	#3F45E0
RGB	rgb(63, 69, 224)
HSL	hsl(238, 72%, 56%)
HSV	hsv(238, 72%, 88%)
CMYK	cmyk(71.9%, 69.2%, 0%, 12.2%)
CIE-LAB	lab(39.06, 47.82, -79.02)
CIE-LCH	lch(39.06, 92.37, 301.18°)
OKLab	oklab(49.45% 0.0106 -0.2286)
OKLCH	oklch(49.45% 0.229 272.7)
XYZ	xyz(17.6280, 10.6930, 71.6415)
Luminance	0.1070 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F45E0 #E0DA3F

analogous

#3F96E0 #3F45E0 #8A3FE0

triadic

#3F45E0 #E03F45 #45E03F

tetradic

#3F45E0 #E03F96 #E0DA3F #3FE08A

square

#3F45E0 #E03F96 #E0DA3F #3FE08A

split-complementary

#3F45E0 #E08A3F #96E03F

monochromatic

#171B8E #1F25C2 #3F45E0 #7478E9 #A8ABF1

Accessibility & contrast

On white

6.69

#3F45E0 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.14

#3F45E0 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3F45E0

6.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F45E0	#FFFFFF	#000000	##FFFFFF
##3F45E0	1.00	6.69	3.14	6.69
#FFFFFF	6.69	1.00	21.00	1.00
#000000	3.14	21.00	1.00	21.00
##FFFFFF	6.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0064E5

Deuteranopia (green-blind)

#0054DD

Tritanopia (blue-blind)

#00708D

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #3f45e0;
/* rgb */ color: rgb(63, 69, 224);
/* oklch */ color: oklch(49.5% 0.229 272.7);

Tailwind

colors: {
  custom: {
    50: '#8b7aeb',
    500: '#3f45e0',
    950: '#000000',
  },
}

SCSS

$custom: #3f45e0;
$custom-light: #8b7aeb;
$custom-dark: #000000;

JSON

{
  "hex": "#3f45e0",
  "rgb": {
    "r": 63,
    "g": 69,
    "b": 224
  },
  "hsl": {
    "h": 237.764,
    "s": 72.197,
    "l": 56.275
  },
  "oklch": {
    "l": 0.49452,
    "c": 0.22882,
    "h": 272.7
  },
  "luminance": 0.10695
}

Semantic roles & 50–950 ramp

primary

#3F45E0

secondary

#DFDC9C

accent

#E839EF

background

#F9F7FE

surface

#F2EDFD

border

#CCC8D5

text

#0E0916

muted

#7E7B84

Preview Lab

Preview with #3F45E0

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →